Optical lens

ABSTRACT

A lens element adapted for a person including a holder including a refraction area having a refractive power based on a prescription for correcting an abnormal refraction of the person, a plurality of optical elements placed on at least one surface of the holder to at least one of: slow down, retard, or prevent a progress of the abnormal refraction of an eye of the person, and at least one layer of at least one coating element covering at least a zone of at least one optical element and at least a zone of the holder on which the optical elements are placed, wherein said at least one layer of at least one coating element adds an optical power of 0.1 diopter in absolute value in specific wearing conditions when measured over said zone of the optical element covered by said at least one layer of at least one coating element.

FIELD OF THE INVENTION

The disclosure relates to a method implemented by computer means fordetermining a lens element. The disclosure also relates to methodsimplemented by computer means for determining transfer laws associatedwith a coating process of a lens element.

Additionally, the disclosure relates to a lens element intended to beworn in front of an eye of a person to slow down and/or prevent aprogression of abnormal refractions of the eye such as myopia orhyperopia.

Furthermore, the disclosure relates to a method implemented by computermeans for determining a mold for a lens element.

Additionally, the disclosure relates to a mold for a lens element aplurality of optical elements having a targeted optical function andintended to be covered by at least one layer of at least one coatingelement.

BACKGROUND OF THE INVENTION

Myopia of an eye is characterized by the fact that the eye focusesdistant objects in front of its retina, hypermetropia is characterizedby the fact that the eye focuses distant objects behind of its retina.Myopia is usually corrected using a concave lens providing negativedioptric power and hypermetropia is usually corrected using a convexlens providing positive dioptric power.

It has been observed that some individuals when corrected usingconventional single vision optical lenses, in particular children, focusinaccurately when they observe an object which is situated at a shortdistance away, that is to say, in near vision conditions. Because ofthis focusing defect on the part of a myopic child which is correctedfor his far vision, the image of an object close by is also formedbehind his retina, even in the foveal area.

Such focusing defect may have an impact on the progression of myopia ofsuch individuals. One may observe that for most of said individual themyopia defect tends to increase over time partly caused by long andintensive near work sessions.

In particular, studies carried out on monkeys have shown that strongdefocusing of the light behind the retina, which occurs away from thefoveal zone, may cause the eye to extend and therefore may cause amyopia defect to increase.

Optical lenses usually undergo numerous treatments adding multipleproperties to the lenses. For example, the use of anti-scratch andanti-reflective treatments have become commonplace. Such treatmentsmostly correspond to an application of a coating layer on a surface ofthe optical lens, adding specific properties to said covered surface.

However, the use of classic treating methods is rendered difficult forlenses having complex designs, such as the recently developed opticallenses comprising optical elements placed on its surface to prevent, orat least slow down, the progression of abnormal refractions of an eyesuch as myopia or hyperopia.

Indeed, the thickness of the coating layer usually used to treat thesurfaces of a lens is not negligible when compared to the size ofoptical elements placed on said surface. For example, the index ofrefraction of the coating layer covering optical elements may impact thelight ray transmission and thus modify the optical function of saidoptical elements. Even a slight thickness heterogeneity of the coatinglayer covering the optical elements may modify the optical function ofsaid optical elements.

Therefore there is a need to provide a method to determine a lenselement comprising optical elements to prevent or at least slow down theprogression of the abnormal refraction of the eye that would compensateand correct the modification of the lens element properties induced by atreatment of said lens element.

Additionally, there is a need to provide a method to determine a moldfor lens element comprising optical elements to prevent or at least slowdown the progression of abnormal refraction of the eye of the wearerthat would compensate and correct the modification of the lens elementproperties induced by a treatment of said lens element.

SUMMARY OF THE INVENTION

To this end, the invention proposes a method for example, implemented bycomputer means for determining a lens element, the lens elementcomprising:

a holder comprising a refraction area having a first refractive power;

a plurality of optical elements placed on at least one surface of theholder, the plurality of optical elements having a second refractivepower that differs from the first refractive power of the holder; and

at least one layer of at least one coating element covering at least azone of at least one optical elements and at least a zone of the holderon which the optical elements are placed,

wherein the method comprises:

providing lens data, the lens data indicating at least a shape of thelens element to be determined, the shape of the lens elementcorresponding to a shape of the holder and to at least a shape of theoptical elements of the lens element, the shape of the optical elementsbeing associated with a targeted optical function;

providing a coating lens transfer law associated with a coating processof a lens element comprising the optical elements, the coating processbeing associated with the coating element, the coating lens transfer lawcorresponding to transformations to apply to the shape of the surface ofthe lens element comprising the optical elements for compensatingmodifications of the targeted optical function of said optical elementsinduced by the coating process; and

determining the lens element, for example adapted for the wearer, basedat least on the lens data and the coating lens transfer law.

Advantageously, determining the lens element based on the lens data andthe coating lens transfer law allows tuning the design of the uncoveredlens element in order to obtain an accurate treated lens element havinga targeted optical function, for example adapted for a wearer oncecovered by the coating layer.

According to further embodiments which can be considered alone or incombination:

the method further comprises manufacturing a lens element based on thedetermined lens element, for example adapted for a wearer; and/or

the method further comprises coating at least a zone of the surface andat least a zone of the at least one optical element with at least onecoating element based on the coating process.

The disclosure further relates to a method implemented by computer meansfor determining a transfer law associated with a coating process of alens element, the method comprising:

providing a lens element, the lens element comprising:

-   -   a holder comprising a refraction area having a first refractive        power,    -   at least one optical element having at least one targeted        optical function and placed on at least one surface of the        holder, the at least one targeted optical function being        different from the first refractive power,

coating at least a zone of the holder and at least a zone of at leastone optical element with at least one coating element based on a coatingprocess, the coating process being associated with the at least onecoating element;

measuring at least one optical characteristic of at least a zone of theat least one optical element covered by the coating element;

determining at least one optical characteristic error based on acomparison of the measured at least one optical characteristic of thecoated optical element and the at least one targeted optical function;

compiling information corresponding to the determined opticalcharacteristic error into database as correction information;

determining a transfer law associated with the coating process and theat least one optical element based on the correction information of thedatabase, the transfer law correcting an original shape of the surfaceof the lens element comprising the at least one optical element so thatonce coated by the at least one coating element, said at least onecoated optical element reaches a targeted optical function.

According to further embodiments which can be considered alone or incombination:

the method comprises, prior to the measuring step, a step ofpolymerizing the at least one coating element covering a zone of theholder and at least a zone of at least one optical element; and/or

the method comprises, further to the coating step, a second step ofcoating at least a zone of the holder and at least a zone of at leastone optical element with at least one coating element based on a coatingprocess, the coating process being associated with the at least onecoating element; and/or

the at least one coating element comprises anti-abrasion features;and/or

the method comprises a step S30 a of providing a mold for a lens elementa person and a step S30 b of obtaining a lens element a person bymolding it; and/or

the transfer law is a coating lens transfer law for correcting anoriginal shape of the surface of the lens element comprising the atleast one optical element so that once coated by the at least onecoating element, said at least one coated optical element reaches atargeted optical function and/or

the transfer law is a coating mold transfer law for correcting anoriginal shape of a surface of the mold for a lens element comprising atleast one surfacic element corresponding to the at least one opticalelement so that once molded and coated by the at least one coatingelement, the at least one coated optical element of the molded andcoated lens reaches a targeted optical function.

Another aspect of the disclosure relates to a lens element, for exampleadapted for a person, and comprising:

a holder comprising a refraction area having a refractive power based ona prescription for correcting an abnormal refraction of the person;

a plurality of optical elements placed on at least one surface of theholder so as to at least one of slow down, retard or prevent a progressof the abnormal refraction of the eye of the person; and

at least one layer of at least one coating element covering at least azone of at least one optical element and at least a zone of the holderon which the optical elements are placed,

wherein said at least one layer of at least one coating element adds anoptical power of 0.1 diopter in absolute value in specific wearingconditions when measured over said zone of the optical element coveredby said at least one layer of at least one coating element.

Advantageously, having the at least one layer of at least one coatingelement participating to the optical power of the optical element allowsobtaining a lens element comprising coated optical elements with aspecific targeted optical function as well as specific treatments. Inother words, the at least one layer of at least one coating elementparticipates to the optical function of the coated optical element whileproviding specific features associated with the coating process of atreatment.

According to further embodiments which can be considered alone or incombination:

the specific wearing condition corresponds to the standard wearingcondition; and/or

the abnormal refraction of the eye is myopia; and/or

the at least one layer of a coating element covering at least oneoptical element is thicker at the periphery of a surface of said coatedoptical elements; and/or

the at least one layer of coating element covering at least one opticalelement is thicker at the center of a surface of said coated opticalelements than at the edge of the surface of said coated opticalelements; and/or

at least a part of the plurality of optical elements are placed on atleast a ring on the at least one surface of the holder; and/or

the plurality of optical elements are placed on concentric rings on theat least one surface of the holder; and/or

the mean sphere of all the coated optical elements placed on aconcentric ring is identical; and/or

the mean sphere of at least part of the coated optical elements variesfrom the center to the edge of the lens element; and/or

the mean sphere of at least part of the coated optical elementsdecreases from the center to the edge of the lens element; and/or

the mean sphere of at least part of the coated optical elementsincreases from the center to the edge of the lens element; and/or

at least part of the optical elements are contiguous.

Another aspect of the disclosure relates to a method implemented bycomputer means for determining a mold for a lens element and comprising

a holder comprising a refraction area having a refractive power;

a plurality of optical elements placed on at least one surface of theholder and having a targeted refractive power different from the firstrefractive power of the holder; and

wherein at least a zone of at least one optical elements and at least azone of the holder on which the optical elements are placed are intendedto be covered by at least one layer of at least one coating element,

wherein the method comprises:

providing mold data indicating at least an initial shape of the mold,the initial shape of the mold corresponding to a shape of the surface ofthe holder and to at least a shape of the optical elements of the lenselement, the shape of the optical elements being associated with thetargeted optical function;

providing a coating mold transfer law associated with a coating processof a lens element comprising the optical elements, the coating processbeing associated with the coating element, the coating mold transfer lawcorresponding to transformations to apply to the shape of the mold forcompensating modifications of the targeted optical function of saidoptical elements induced by the coating process; and

determining a shape of the mold for a lens element based at least on themold data and the coating mold transfer law.

Advantageously, determining a mold for a lens element based on the molddata and the coating mold transfer law allows tuning the design of themold to easily produce a large number of uncovered lens element in orderto obtain an accurate treated lens element, for example adapted for awearer once covered by the coating layer.

According to further embodiments which can be considered alone or incombination:

the method further comprises providing a cooling transfer law associatedwith a cooling process of a molded lens element comprising opticalelements, the cooling transfer law corresponding to transformations toapply to the shape of the mold for compensating modifications of thetargeted optical function of said optical elements induced by theretraction of the lens element material during the cooling process,wherein the shape of the mold for a lens element is determined based onthe mold data, the coating mold transfer law and the cooling transferlaw.

The disclosure further relates to a mold for a lens element comprising aplurality of optical elements having a targeted optical function andintended to be covered by at least one layer of at least one coatingelement, comprising:

a first molding element having a first surface, the first surface havinga first surfacic curvature and comprising a plurality of surfacicelements having at least a second surfacic curvature that differs fromthe first,

a second molding element having a second surface,

a gasket having an inner and an outer surfaces,

wherein the first surface of the first molding element, the secondsurface of the second element and the inner surface of the gasket form amolding cavity in which a molding material is to be filled.

According to further embodiments which can be considered alone or incombination:

the gasket comprises an opening through which the molding material isinjected in the molding cavity; and/or

the molding material is a thermo-plastic material injected in themolding cavity; and/or

the molding material is a casting material casted into the moldingcavity and polymerized; and/or

at least part, for example 50%, preferably 80%, more preferably all thesurfacic elements of the plurality of surfacic elements present an axisof symmetry (Di); and/or

the plurality of surfacic elements have a contour shape beinginscribable in a circle (C) having a diameter greater than or equal to0.8 mm and smaller than or equal to 3.0 mm; and/or

the axis of symmetry (Di) of the surfacic elements is also the center ofthe corresponding circle (C); and/or

the mean surfacic curvature of the surfacic element in a central zone ofthe surfacic element is different from the mean surfacic curvature ofthe surfacic element in a peripheral zone of the surfacic element, thecentral zone of the surfacic element corresponding to a circular zonecomprised in the circle (C), having the same center as said circle (C)and a radius equal to 0.75 times the radius of the circle (C), theperipheral zone of the surfacic element corresponding to the concentricring of the circle (C) distant by at least 0.75 times the radius of thesurface of the surfacic element; and/or

along a section of the surfacic element passing through the intersectionpoint between the axis of symmetry (Di) of said surfacic element andsaid surfacic element, the surfacic curvature of the surfacic elementincreases along the section from said intersection to a first point anddecreases from the first point to the periphery of the section; and/or

at least two of the plurality of surfacic elements are non-contiguous;and/or

at least two of the plurality of surfacic elements are contiguous;and/or

the plurality of surfacic elements are positioned on a structurednetwork; and/or

the plurality of surfacic elements are positioned along a plurality ofconcentric rings; and/or

the surfacic curvature of the surfacic elements placed on the sameconcentric ring are identical

the plurality concentric rings of surfacic elements are centered on thegeometric center of the first surface of the first molding element;and/or

along at least one section of the first molding element, the surfaciccurvature of the plurality of surfacic elements increases from a pointof said section towards the peripheral part of said section; and/or

along at least one section of the first molding element passing througha geometric center of the first surface of said molding element, thesurfacic curvature of the plurality of surfacic elements increases fromsaid geometric center towards the peripheral part of said section;and/or

along at least one section of the first molding element, the surfaciccurvature of the plurality of surfacic elements increases from a firstpoint of said section towards the peripheral part of said section anddecreases from a second point of said section towards the peripheralpart of said section, the second point being closer to the peripheralpart of said section than the first point; and/or

for every circular zone having a radius comprised between 4 and 8 mm andcomprising a geometrical center of the first surface of the firstmolding element greater than or equal to said radius+5 mm, the ratiobetween the sum of areas of the parts of the plurality of surfacicelements located inside said circular zone and the area of said circularzone is comprised between 20% and 70%.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments of the invention will now be described, by way of exampleonly, and with reference to the following drawings in which:

FIG. 1 illustrates a plan view of a lens element according to anembodiment of the disclosure,

FIG. 2 illustrates a general profile of a lens element according to anembodiment of the disclosure,

FIG. 3 illustrates an exploded view of a mold for a lens elementaccording to an embodiment of the disclosure,

FIG. 4 illustrates a chart-flow embodiment of the method for determininga lens element according to the disclosure,

FIG. 5 illustrates a chart-flow embodiment of the method for determininga mold for a lens element according to the disclosure,

FIG. 6 illustrates a chart-flow embodiment of the method for determininga transfer law associated with a coating process of a surface of a lenselement according to the disclosure,

FIG. 7 illustrates a close up plan view of a coated optical element ofthe lens element according to an embodiment of the disclosure,

FIGS. 8A, 8B and 8C illustrate different close up profile views of anoptical element of the lens element according to an embodiment of thedisclosure,

FIG. 9 illustrates a plan view of a lens element according to anembodiment of the disclosure, and

FIG. 10 illustrates a plan view of a lens element according to anembodiment of the disclosure.

Elements in the figures are illustrated for simplicity and clarity andhave not necessarily been drawn to scale. For example, the dimensions ofsome of the elements in the figure may be exaggerated relative to otherelements to help to improve the understanding of the embodiments of thepresent disclosure.

DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION

The disclosure relates to a method for determining a lens element, forexample adapted for a wearer.

In the context of the present disclosure, the term “lens element” canrefer to lens blank having a finished face and an unfinished face wherethe unfinished is intended to be surfaced to provide an uncut opticallens, an uncut optical lens or a spectacle optical lens edged to fit aspecific spectacle frame or an ophthalmic lens.

The lens element according to the disclosure is described as beingadapted for a person and intended to be worn in front of an eye of saidperson to prevent or at least slow down a progression of abnormalrefractions of the eye such as myopia or hyperopia. However, it willappears clearly to the person skilled in the art that the lens elementmay have any optical function, for example an optical function notadapted to the wearer.

As illustrated on FIG. 1, the lens element 2 according to the disclosurecomprises a holder 4 having a refraction area 6 and a plurality ofoptical elements 8 placed on at least one surface of said holder.

The holder 4 is, for example, made of polycarbonate material.

The refraction area 6 has a first refractive power, for example based onthe prescription of the eye of the person. The prescription is adaptedfor correcting the abnormal refraction of the eye of the person.

The term “prescription” is to be understood to mean a set of opticalcharacteristics of optical power, of astigmatism, of prismaticdeviation, determined by an ophthalmologist or optometrist in order tocorrect the vision defects of the eye, for example by means of a lenspositioned in front of his eye. For example, the prescription for amyopic eye comprises the values of optical power and of astigmatism withan axis for the distance vision.

For example, the shape of a refraction area 6 is spherical. The shape ofthe other face is configured so that the refraction area has an opticalfunction of focusing an image on the retina.

For example the shape of said second face is sphero-torical.Advantageously, the shape of said second face is aspherical andcalculated by an optical optimization such that every light beamincident on the refraction area 6 is focused on the retina of the wearerwhen the lens is worn.

The refraction area 6 is preferably formed by the area not covered byany optical element of the plurality of optical elements 8. In otherwords, the refractive area is the complementary area to the areas formedby the plurality of optical elements 8.

According to different embodiments of the disclosure, the abnormalrefraction of the eye is myopia, hyperopia or astigmatism.

The lens element 2 according to the disclosure further comprises aplurality of optical elements 8. The optical elements 8 are placed on atleast one surface of the holder 4. Preferably, the optical elements 8are placed on the front face of the lens element 2. The front face ofthe lens element 2, or “object side” face, corresponds to the face ofthe lens element which is not facing the eye of the person.

In the sense of the disclosure, the term “plurality of” is to beunderstood as “at least three”.

At least one optical element of the plurality of optical elements 8 hasa second optical function, for example an optical function of notfocusing an image on the retina of the eye of the wearer. In otherwords, at least one optical element of the plurality of optical elements8 has an optical function of focusing an image in front of and/or behindthe retina of the wearer.

When the abnormal refraction of the eye of the person corresponds tomyopia the optical elements 8 have an optical function of focusing animage in front of the retina of the eye of the wearer when worn by thewearer.

When the abnormal refraction of the eye of the person corresponds tohypermetropia the optical elements 8 have an optical function offocusing an image behind the retina of the eye of the wearer when wornby the wearer.

Preferably, at least 30%, for example at least 80%, for example all, ofthe optical elements have an optical function of focusing an image on aposition other than the retina.

In the sense of the disclosure “focusing” is to be understood asproducing a focusing spot with a circular section that can be reduced toa point in the focal plane.

Advantageously, such optical function of the optical element produces anoptical signal that inhibits the deformation of the retina of the eye ofthe wearer, allowing to prevent or at least slow down the progression ofthe abnormal refraction of the eye of the person wearing the lenselement 2.

As represented on FIG. 2, the lens element 2 comprises at least onelayer 10 of at least one coating element. The at least one layer 10 ofat least one coating element covers at least a zone of at least oneoptical element 8 and at least a zone of the holder 4 on which theoptical elements are placed.

The at least one layer 10 of at least one coating element may becharacterized by different parameters such as an index of refraction anda thickness. The coating layer 10 is also defined by a coating processcharacterized by different parameters such as for example the curingtime or the temperature and/or viscosity of the coating element duringthe coating operations.

The at least one layer 10 of at least one coating element ischaracterized by a refractive index and a local thickness, and thusparticipates to the optical function of the optical elements.

Moreover, when the at least one layer 10 of at least one coating elementis applied on the lens element, the viscosity of the at least onecoating element combined with the complex shape of the surface of thelens element comprising the plurality of optical elements may result ina non-homogenous repartition of said at least one coating element overthe surface of the lens element.

As illustrated on FIG. 4, the method for determining a lens according tothe disclosure comprises a step S2 of providing lens data. The lens dataindicates at least the shape of the lens element to be determined.

The shape of the lens element corresponds to a shape of the holder, andto at least a shape of the optical elements of the lens element to bedetermined. The shape of the holder is associated with the prescriptionfor correcting the abnormal refraction of the eye of the person. Theshape of the optical elements is associated with a target opticalfunction of said optical elements.

The method for determining a lens element according to the disclosurefurther comprises a step S4 of providing a coating lens transfer lawassociated with a coating process of the lens element comprising theoptical elements. The coating process is associated with at least onecoating element.

The coating process may further relate to the shape of the surface ofthe lens element bearing the optical elements 8, the shape of theoptical elements, a targeted thickness of the at least one coating layer10 of at least one coating element, and the conditions of application ofthe at least one coating element.

For example, the conditions of application of the at least one coatingelement may relate to the withdrawal speed for a dip-coating typeprocess or the rotation speed for spin-coating. The conditions ofapplication may also relate to drying parameters.

The coating lens transfer law corresponds to transformations to apply tothe shape of the surface of the lens element comprising the opticalelements 8 for compensating modifications of the targeted opticalfunction of the optical elements induced by the coating process.

For example, for a specific coating process, the at least one coatinglayer 10 of at least one coating element may be thicker at proximity ofthe optical center of the optical element 8 than in the periphery of theoptical element 8. This will result in a coated optical element 8 havingan optical power different than its targeted optical power. In suchcase, the coating lens transfer law will correspond to thetransformations to apply to the shape of the surface of the lens elementcomprising the optical element 8 in order to obtain a coated opticalelement having an optical power as close as possible to the targetedoptical power of the optical element.

Advantageously, the coating lens transfer law may be determined by amethod according to another aspect of the disclosure.

The method for determining a lens element according to the disclosurefurther comprises a step S6 of determining the lens element adapted tothe wearer based at least on the lens data and the coating lens transferlaw.

Advantageously, determining the lens element based on the lens data andthe coating lens transfer law allows tuning the design of the uncoveredlens element in order to obtain an accurate treated lens element, forexample adapted for a wearer, once covered by the coating layer.

According to an embodiment of the disclosure, the method for determininga lens element may further comprise a step S8 of manufacturing the lenselement 2 determined based on the lens data and the coating transfer lawassociated with a coating process.

Additionally, the method for determining a lens element may furthercomprise a step S10 of coating at least a zone of the holder and a zoneof at least one optical element with at least one coating element basedon the coating process.

Furthermore, the method for determining a lens element according to thedisclosure may further comprise a step of polymerizing the at least onecoating element covering a zone of the holder and a zone of at least oneoptical element.

The method according to the disclosure may comprise, further to thecoating step, a second step of coating at least a zone of the holder anda zone of at least one optical element with at least one coating elementbased on the coating process.

The at least one coating element used during the second step of coatingmay be identical to the at least one coating element used during thefirst step of coating.

The at least one coating element may comprise features selected from thegroup consisting of anti-scratch, anti-reflection, anti-smudge,anti-dust, UV-filtration, blue light-filtration. Advantageously, the atleast one coating element may comprise anti-abrasion features.

The disclosure further relates to a method implemented by computer meansfor determining a mold for a lens element, for example a lens element.

As illustrated in FIG. 3, the mold 20 for a lens element 2 comprising aplurality of optical elements 8 having a targeted optical function andintended to be covered by at least one layer of at least one coatingelement 10 according to the disclosure comprises a first molding element21, a second molding element 22 and a gasket 23.

The first molding element 21 has a first surface 24 having a firstsurfacic curvature. For example the first surface 24 has a sphericalsurfacic curvature. Alternatively, the first surface 24 may have anaspherical surfacic curvature and/or a cylindrical surfacic curvatureand/or a toric surfacic curvature. The first surface 24 of the firstmolding element 21 corresponds to the surface of the holder 4 of thelens element 2. For example, the first surface 24 may corresponds to thesurface of the holder 4 having an optical function based on aprescription of a wearer.

The first molding element 21 further comprises a plurality of surfacicelements 26 having at least a second surfacic curvature that differsfrom the first curvature of the first surface 24. For example, thesurfacic elements 26 of the first surface 24 of the first moldingelement 21 may correspond to the optical element 8 of the lens 2.

Part of, preferably all of the plurality of surfacic elements 26 presentan axis of symmetry (Di).

The plurality of surfacic elements 26 have a contour shape beinginscribable in a circle (C) having a diameter greater than or equal to0.8 mm and smaller than or equal to 3.0 mm. The circle (C) may be aplanar projection of the surface of the surfacic element, for example ina plane orthogonal to the axis of symmetry of the surfacic element.

The axis of symmetry of each surfacic elements 26 may correspond to thecenter of circle in which each surfacic element is respectivelyinscribed.

The second surfacic curvature of at least one of the plurality ofsurfacic elements 26 may be a spherical and/or aspherical and/orcylindrical and/or toric surfacic curvature. The plurality of surfacicelements 26 of the first molding element 21 correspond to the opticalelements 8 placed on the hold 4 of the lens element 12.

In the sense of the disclosure, aspherical surfacic elements have acontinuous evolution over their surface.

For each surfacic element 26, one may define a central zone and aperipheral zone of the surfacic element. The central zone of thesurfacic element corresponds to a circular zone comprised in the circle(C), having the same center as circle (C) and having a radius equal to0.75 tiles the radius of the circle (C). The peripheral zone of thesurfacic element corresponds to the concentric ring of the circle (C)distant by at least 0.75 times the radius of the circle (C).

The mean surfacic curvature of the surfacic element in the central zoneof said surfacic element is different from the mean surfacic curvatureof the surfacic element in the peripheral zone of said surfacic element.For example, the mean surfacic curvature in the central zone is higherthan the mean surfacic curvature in the peripheral zone of said surfacicelement. Alternatively, the mean surfacic curvature in the central zonemay be lower than the mean surfacic curvature in the peripheral zone ofsaid surfacic element.

Along a section of a surfacic element 26 a section passing through theaxis of symmetry (Di) of said surfacic element, the surfacic curvatureof the surfacic element increases from the intersection between the axisof symmetry and the surface of the surfacic element to a first point,and decrease from said first point to the periphery of the surfacicelement.

At least one, preferably 50%, more preferably more than 80% of theplurality of surfacic elements 26 may have a toric surface. A toricsurface is a surface of revolution that can be created by rotating acircle or arc about an axis of revolution (eventually positioned atinfinity) that does not pass through its center of curvature. Toricsurface elements have two different radial profiles at right angles toeach other.

The toric surfacic element may be a pure cylinder, meaning that minimummeridian is zero, while maximum meridian is strictly positive.

According to an embodiment of the disclosure, at least two of theplurality of surfacic elements 26 are non-contiguous. In the sense ofthe disclosure, two surfacic elements are non-contiguous if for all thepaths linking the two surfacic elements one may measure at least alongpart of each path the first surfacic curvature of the first surface 24of the first molding element 21.

According to an embodiment of the disclosure, at least two of theplurality of surfacic elements 26 are contiguous. In the sense of thedisclosure two surfacic elements are contiguous if for at least one pathlinking the two surfacic elements one may not measure along said atleast one path the first surfacic curvature of the first surface 24 ofthe first molding element 21.

At least part, for example all of the plurality of surfacic elements 26may be positioned on a structured network.

According to an embodiment of the disclosure, the disposition of atleast part, for example all of the plurality of surfacic elements 26 onthe first surface of the first molding element exhibit symmetry ofrevolution about an axis, for example centered on the geometrical centerof the first surface 24 of the first molding element 21. In other words,at least part of the plurality of surfacic element 16 may be regularlydistributed along at least one circle centered on the geometrical centerof the first surface 24 of the first molding element 21.

According to an embodiment of the disclosure, at least part, for exampleall of the plurality of surfacic elements 26 are placed on at least aring on the first surface 24 of the first molding element 21.

The plurality of surfacic elements may further be organized onconcentric rings on the first surface of the first molding element. Forexample, the plurality of surfacic elements 26 are positioned along aset of 11 concentric rings over the entire first surface 24 of the firstmolding element 21. The concentric rings of surfacic elements may becentered on the geometrical center of the first surface 24 of the firstmolding element 21.

The mean surfacic curvature of the plurality of surfacic elements 26 maybe identical for all the surfacic elements of the same concentric ring.In particular, the mean surfacic curvatures of the central zone of thesurfacic elements 26 of the same concentric ring are identical.

According to other embodiments of the disclosure, the plurality ofsurfacic elements 26 may be organized on different patterns, such as forexample square shaped pattern.

The plurality of surfacic elements 26 may be configured so that along atleast one section of the first molding element 21, the mean surfaciccurvature of the plurality of surfacic elements, for example the meansurfacic curvature of the central zone of the plurality of surfacicelements 26 increases from a point of the section towards the peripheralpart of said section.

The plurality of surfacic elements 26 may be configured so that along atleast one section of the first molding element 21 passing through ageometric center of the first surface 24 of said first molding element,the mean surfacic curvature of the plurality of surfacic elements 26increases from said geometric center towards the peripheral part of saidsection. For example, the mean surfacic curvature of the central zone ofthe surfacic elements 26 increases along the section passing through thegeometric center of the first surface of the first molding element fromsaid geometric center to the periphery. Similarly, the mean surfaciccurvature of the peripheral zone of the surfacic elements may increasealong the section passing through the geometric center of the firstsurface of the first molding element from said geometric center to theperiphery.

The plurality of surfacic elements 26 may be configured so that along atleast one section of the first molding element 21, for example a sectionpassing through the geometric center of the first surface of the firstmolding element, the mean surfacic curvature of the plurality ofsurfacic elements 26, for example the mean surfacic curvature of thecentral zone of the plurality of surfacic element, increases from afirst point of said section towards the peripheral part of said sectionand decreases from a second point of said section towards the peripheralpart of said section, the second point being closer to the peripheralpart of said section than the first point.

For every circular zone having a radius comprised between 4 and 8 mmcomprising a geometrical center of the first surface of the firstmolding element greater or equal to said radius+5 mm, the ratio betweenthe sum of areas of the plurality of surfacic elements located insidesaid circular zone and the area of said circular zone is comprisedbetween 20% and 70%.

The mold 20 for the lens element 2 further comprises a second moldingelement 22. The second molding element 22 has a second surface 25. InFIG. 3, the second surface 25 of the second molding element 22 is notrepresented as it faces the first surface 24 of the first moldingelement.

The mold 20 for the lens element 2 further comprises a gasket 23. Thegasket 23 has an annular form comprising an inner surface 23 a and anouter surface 23 b. The gasket 23 further comprises an opening 27.

The gasket 23 seals the first and second molding elements 21 and 22together to form a molding cavity 28. The molding cavity 28 is definedby the first surface 24 comprising the surfacic elements 26 of the firstmolding element 21, the second surface 25 of the second molding element22, and the inner surface 23 a of the gasket 23.

The molding cavity 28 of the mold 20 for a lens element 2 is filled witha molding material through the opening 27. Despite being represented inthe gasket 23, the opening 27 may alternatively be placed on the firstmolding element or the second molding element.

For example, the molding material may be a casting material poured intothe molding cavity through the opening 27 of the gasket 23. The castingmaterial in the molding cavity is further polymerized into a lensmaterial thereby forming the lens element 2.

Alternatively, the molding material may be a thereto-plastic material.The thermo-plastic material which is in a first liquid state at a firsttemperature is injected into the mold cavity 28 through opening 27.During the cooling process, the thermo-plastic material changes from afirst liquid state to a second solid state corresponding to the lensmaterial of lens element 2.

As illustrated on FIG. 5, the method for determining a mold for a lensaccording to the disclosure comprises a step S12 of providing mold data.The mold data indicates at least an initial shape of the mold for thelens element to be determined.

The initial shape of the mold for a lens element corresponds to a shapeof the first surface of the first molding element comprising theplurality of surfacic elements and to the shape of the surface of theplurality of surfacic elements. The shape of the first surface of thefirst molding element correspond to the shape of the holder of the lenselement which is associated with the prescription for correcting theabnormal refraction of the eye of the person. The shape of the surfaceof plurality of surfacic elements correspond to the shape of the opticalelements of the lens element which is associated with a targeted opticalfunction of said optical elements.

The method for determining a mold for a lens element according to thedisclosure further comprises a step S14 of providing a coating moldtransfer law associated with a coating process of the lens elementcomprising the optical elements. The coating process is associated withat least one coating element.

The coating process may further relate to the shape of the surface ofthe lens element bearing the optical elements 8, the shape of theoptical elements, a targeted thickness of the at least one coating layer10 of at least one coating element, and the conditions of application ofthe at least one coating element.

For example, the conditions of application of the at least one coatingelement may relate to the withdrawal speed for a dip-coating typeprocess or the rotation speed for spin-coating. The conditions ofapplication may also relate to drying parameters.

The coating mold transfer law corresponds to transformations to apply tothe shape of the initial surface of the mold for the lens element forcompensating modifications of the targeted optical function of theoptical elements induced by the coating process.

For example, for a specific coating process, the at least one coatinglayer 10 of at least one coating element may be thicker at proximity ofthe optical center of the optical element 8 than in the periphery of theoptical element 8. This will result in a coated optical element 8 havingan optical power different than its targeted optical power. In suchcase, the coating mold transfer law will correspond to thetransformations to apply to the shape of the initial first surface 24 ofthe first molding element 21 comprising the plurality of surfacicelements in order to obtain a coated optical element having an opticalpower as close as possible to the targeted optical power of the opticalelement.

Advantageously, the coating mold transfer law may be determined by amethod according to another aspect of the disclosure.

The method for determining a mold for a lens element according to thedisclosure further comprises a step S16 of determining a shape of themold for the lens element adapted to the wearer based at least on themold data and the coating mold transfer law.

Advantageously, determining the mold for the lens element based on themold data and the coating mold transfer law allows tuning the design ofthe first surface of the mold and of the surfacic elements to provide anuncovered lens element adapted to become an accurate treated lenselement, for example adapted for a wearer, once covered by the coatinglayer.

According to another embodiment of the disclosure, the method fordetermining a mold for a lens element comprises prior to the step ofdetermining the shape of the mold, a step S15 of providing a coolingtransfer law.

The cooling transfer law is associated with a cooling process of amolded lens element comprising optical elements.

The cooling transfer law corresponds to transformations to apply to theshape of the mold for compensating modifications of a targeted opticalfunction of the optical elements induced by the retraction of the lenselement material during the cooling process.

The shape of the mold for a lens element may further be determined basedon the mold data, the coating mold transfer law and the cooling transferlaw.

The method may further comprises a step S18 of manufacturing the lenselement. The lens element may be manufactured by casting a moldingmaterial and polymerizing said molding material or by injecting amolding material and cooling said molding material.

The method may further comprises a step S20 of coating the molded lenselement based on the coating process.

Another aspect of the disclosure relates to a method implemented bycomputer means for determining a transfer law associated with a coatingprocess of a lens element.

As represented on FIG. 6, the method for determining a transfer lawassociated with a coating process of a lens element according to thedisclosure comprises:

a step S30 a of providing a mold for a lens element and a step S30 b ofobtaining a lens element,

a step S32 of providing a lens element,

a step S34 of coating at least a zone of the holder and at least a zoneof the at least one optical element,

a step S36 of measuring at least one optical characteristic of the atleast one zone of the at least one optical element covered by thecoating element,

a step S38 of determining at least one optical characteristic error,

a step S40 of compiling information corresponding to the determinedoptical characteristic error, and

a step S42 of determining a transfer law.

During step S32, a lens element, for example adapted for a person, isprovided.

Alternatively, the method may comprise a step S30 a of providing a moldfor a lens element and a step S30 b of obtaining a lens element bymolding it.

The lens element comprises a holder comprising a refraction area havinga first refractive power. For example, the lens element may be adaptedfor a person and the first refractive power may be based on aprescription for correcting an abnormal refraction of an eye of theperson.

The lens element further comprises at least one optical element havingat least one targeted optical function and placed on at least onesurface of the holder. The targeted optical function of the at least oneoptical element may be to focus an image in front and/or behind theretina of the wearer so as to prevent or at least slow down a progressof the abnormal refraction of the eye of the person.

During step S34, at least a zone of the holder and at least a zone of atleast one optical element is coated with at least one coating elementbased on a coating process. The coating process is at least associatedwith the at least one coating element.

The coating process may further relate to a shape of the lens element, ashape of the optical elements, a targeted thickness of the coating layerof at least one coating element, and conditions of the application ofthe at least one coating element.

According to an embodiment of the disclosure, the method for determininga transfer law associated with a coating process of a lens element mayfurther comprise, further to the coating step, a second step S342 ofcoating at least a zone of the holder and at least a zone of at leastone optical element with at least one coating element based on a coatingprocess. The coating process is associated with the at least one coatingelement.

The at least one coating element used during the coating step S34 may beidentical as the coating element used during the coating step S342.Preferably, the at least one coating element used during the coatingstep S342 is different from the at least one coating element used duringthe coating step S34.

The at least one coating element may comprise features selected from thegroup consisting of anti-scratch, anti-reflection, anti-smudge,anti-dust, UV-filtration, blue light-filtration. Advantageously, the atleast one coating element may comprise anti-abrasion features.

The method according to the disclosure may further comprise a step S344of polymerizing the at least one coating element covering at least azone of the holder and at least a zone of the at least one opticalelement.

The method according to the disclosure may further comprise, further tothe second coating step S342, a second step of polymerizing the at leastone coating element covering at least a zone of the holder and at leasta zone of the at least one optical element.

During step S36, at least one optical characteristic of at least a zoneof the at least one optical element covered by the coating element ismeasured. The optical characteristic of a zone of the optical elementrefers at least to the optical power.

During step S38, at least one optical characteristic error is determinedbased on the comparison of the measured at least one opticalcharacteristic of the coated optical element and the at least onetargeted optical function.

During step S40, information corresponding to the determined opticalcharacteristic error is compiled into a database as correctioninformation.

During step S42, a transfer law associated with the at least one coatingprocess and the at least one optical element is determined based on thecorrection information of the database.

The transfer law may be a coating lens transfer law used to correct anoriginal shape of the surface of the lens element comprising the atleast one optical element so that once coated by the at least onecoating element, said at least one coated optical element reaches atargeted optical function.

Alternatively, the transfer law may be a coating mold transfer law usedto correct an original shape of a surface of the mold for a lens elementcomprising at least one surfacic element corresponding to the at leastone optical element so that once molded and coated by the at least onecoating element, the at least one coated optical element of the moldedand coated lens reaches a targeted optical function.

According to an embodiment of the disclosure, the method for determininga to transfer law associated with a coating process of a lens elementmay comprise a step of providing a lens element S32, a step of coatingthe lens element S24, a step of measuring optical characteristics S26, astep of determining an optical characteristic error S26, and a step ofdetermining a transfer law based on the determined opticalcharacteristics error, and wherein the steps are repeated until the mostadapted transfer law is determined. The most adapted transfer lawcorresponds to the transfer law for which the modifications of the lenselement characteristics induced by the coating layer are bestcompensated.

Another aspect of the disclosure relates to a lens element, for exampleadapted for a wearer, the lens element comprising a holder 4 having arefraction area 6, a plurality of optical elements 8 placed on at leastone surface of said holder, and at least one coating layer 10 of atleast one coating element covering at least a zone of at least anoptical element 8 and at least a zone of the holder 4 on which theoptical element are placed.

The at least one layer 10 of at least one coating element adds anoptical power of 0.1 diopter in absolute value in specific wearingconditions when measured over a zone of the optical element covered bysaid layer of said coating element.

In other words, when the abnormal refraction of the eye of the personcorresponds to myopia, the at least one layer 10 of at least one coatingelement increases the optical power over a zone of the optical elementcovered by said coating layer by 0.1 diopter in absolute value inspecific wearing conditions.

When the abnormal refraction of the eye of the person corresponds tohypermetropia, the at least one layer 10 of at least one coating elementreduces the optical power over a zone of the optical element covered bysaid coating layer by 0.1 diopter in specific wearing conditions.

Advantageously, having the at least one layer of at least one coatingelement participating to the optical power of the optical element allowsobtaining a lens element comprising coated optical elements with aspecific targeted optical function as well as specific treatments. Inother words, the at least one layer of at least one coating elementparticipates to the optical function of the coated optical element whileproviding specific features associated with the coating process of atreatment.

The specific wearing condition may be standard wearing conditions.

The specific wearing condition may be personalized wearing conditionsthat are measured on the wearer when the wearer wears a spectacle framehe/she chose.

The wearing conditions are to be understood as the position of the lenselement with relation to the eye of a wearer, for example defined by apantoscopic angle, a Cornea to lens distance, a Pupil-cornea distance, acenter of rotation of the eye (CRE) to pupil distance, a CRE to lensdistance and a wrap angle.

The Cornea to lens distance is the distance along the visual axis of theeye in the primary position (usually taken to be the horizontal) betweenthe cornea and the back surface of the lens; for example equal to 12 mm.

The Pupil-cornea distance is the distance along the visual axis of theeye between its pupil and cornea; usually equal to 2 mm.

The CRE to pupil distance is the distance along the visual axis of theeye between its center of rotation (CRE) and cornea; for example equalto 11.5 mm.

The CRE to lens distance is the distance along the visual axis of theeye in the primary position (usually taken to be the horizontal) betweenthe CRE of the eye and the back surface of the lens, for example equalto 25.5 mm.

The pantoscopic angle is the angle in the vertical plane, at theintersection between the back surface of the lens and the visual axis ofthe eye in the primary position (usually taken to be the horizontal),between the normal to the back surface of the lens and the visual axisof the eye in the primary position; for example equal to 8°.

The wrap angle is the angle in the horizontal plane, at the intersectionbetween the back surface of the lens and the visual axis of the eye inthe primary position (usually taken to be the horizontal), between thenormal to the back surface of the lens and the visual axis of the eye inthe primary position for example equal to 0°.

An example of standard wearer condition may be defined by a pantoscopicangle of 8°, a Cornea to lens distance of 12 mm, a Pupil-cornea distanceof 2 mm, a CRE to pupil distance of 11.5 mm, a CRE to lens distance of25.5 mm and a wrap angle of 0°.

According to an embodiment of the disclosure, for at least one coatedoptical elements, the thickness of the at least one coating layer 10 ofat least one coating element varies over the surface of the said opticalelement.

For each point of the lens element 2, the thickness of the coating layer10 of an abrasion resistant element corresponds to the length of theline orthogonal to the surface of the lens element at said specificpoint of said surface and passing through the at least one coating layer10 of at least one coating element

In the sense of the disclosure, the coated optical elements correspondsto the optical elements covered by the at least one coating layer 10 ofat least one coating element

As represented on FIG. 7, the coated optical elements have a contourshape being inscribable in a circle L, the circle L representing thesurface of said coated optical element. The center 12 of the coatedoptical element is to be understood as a zone comprised in the circle L,having the same center as said circle L and a radius equal to 0.75 timesthe radius of the circle L. The periphery 14 of the coated opticalelements is to be understood as the concentric ring of the circle Ldistant by at least 0.75 times the radius of surface of the coatedoptical element.

FIG. 8A illustrates a coated optical element covered by a uniform layerof at least one coating element.

As represented on FIG. 8B, the at least one coating layer 10 of at leastone coating element may be thicker in the periphery of the surface of acoated optical element than in the optical center of said coated opticalelement.

As represented on FIG. 8C, the at least one coating layer 10 of at leastone coating element may be thicker in the center of the surface of acoated optical element than at the edge of the surface of said coatedoptical element.

With reference to FIGS. 8B and 8C, the dotted lines represents themodifications to apply to the shape of the optical element to compensatethe modification of the targeted optical function of said opticalelement induced by the coating process. This result in a coating elementhaving a non-uniform thickness over said optical element.

The optical elements 8 may be as represented on FIGS. 1, 2 and 9,non-contiguous optical elements.

In the sense of the disclosure, two optical elements are non-contiguousif for all the paths linking the two optical elements one may measure atleast along part of each path the refractive power based on aprescription for the eye of the person.

According to an embodiment of the disclosure, at least part of theplurality of optical elements are placed on at least a ring on the atleast one surface of the lens element.

According to another embodiment of the disclosure, the plurality ofoptical elements are organized on concentric rings on the at least onesurface of the lens element 2.

With reference to FIG. 9, the plurality of coated optical elements arepositioned along a set of 11 concentric rings over the entire surface ofthe lens element.

According to other embodiments of the disclosure, the plurality ofoptical elements may be organized on different patterns, such as forexample square shaped pattern.

According to an embodiment of the disclosure, the mean sphere of all thecoated elements 8 placed on a ring is identical. In the sense of thedisclosure, the term “identical” is to be understood as being within arange of more or less 5% of the value.

Although being part of the technical knowledge of a person skilled inthe art, reference is made to the definition of mean sphere disclosed inWO 2016/146590.

According to another embodiment of the disclosure, the mean sphere of atleast part of the coated optical elements varies according to theoptical element location on the lens element, more specificallyaccording to the distance of the optical element from the geometricalcenter of the lens element.

According to an embodiment of the disclosure, the mean sphere of atleast part of the coated optical element increases from the center tothe edge of the lens element.

According to an embodiment of the disclosure, the mean sphere of atleast part of the coated optical element decreases from the center tothe edge of the lens element.

According to another embodiment of the disclosure, the mean sphere of atleast part of the coated optical element increases from the center tothe edge of the lens element.

According to an embodiment of the disclosure illustrated on FIG. 10, thecoated optical elements are contiguous.

In the sense of the disclosure two optical elements are contiguous iffor at least one path linking the two optical elements one may notmeasure along said at least one path the refractive power based on aprescription for the eye of the person.

Advantageously, each of these configurations of coated optical elementsallows providing a balance between slowing down the progression of theabnormal refraction of the eye of a person and maintaining acceptablevision performance and/or wearing comfort of said person.

The disclosure has been described above with the aid of embodimentswithout limitation of the general inventive concept.

Many further modifications and variations will suggest themselves tothose skilled in the art upon making reference to the foregoingillustrative embodiments, which are given by way of example only andwhich are not intended to limit the scope of the disclosure, that beingdetermined solely by the appended claims.

In the claims, the word “comprising” does not exclude other elements orsteps, and the indefinite article “a” or “an” does not exclude aplurality. The mere fact that different features are recited in mutuallydifferent dependent claims does not indicate that a combination of thesefeatures cannot be advantageously used. Any reference signs in theclaims should not be construed as limiting the scope of the disclosure.

1. A method implemented by computer for determining a mold for a lenselement, the lens element comprising a holder comprising a refractionarea having a first refractive power; a plurality of optical elementsplaced on at least one surface of the holder having a second refractivepower different from the first refractive power of the holder; andwherein at least a zone of at least one optical elements and at least azone of the holder on which the optical elements are placed are intendedto be covered by at least one layer of at least one coating element,wherein the method comprises: providing mold data indicating at least aninitial shape of the mold, the initial shape of the mold correspondingto a shape of the surface of the holder and to at least a shape of theoptical elements of the lens element, the shape of the optical elementsbeing associated with a targeted optical function; providing a coatingmold transfer law associated with a coating process of a lens elementcomprising the optical elements, the coating process being associatedwith the coating element, the coating mold transfer law corresponding totransformations to apply to the shape of the mold for compensatingmodifications of the targeted optical function of said optical elementsinduced by the coating process; and determining a shape of the mold fora lens element based at least on the mold data and the coating moldtransfer law.
 2. The method according to claim 1 further comprisingprior to determining a shape of the mold: providing a cooling transferlaw associated with a cooling process of a molded lens elementcomprising optical elements, the cooling transfer law corresponding totransformations to apply to the shape of the mold for compensatingmodifications of the targeted optical function of said optical elementsinduced by the retraction of the lens element material during thecooling process, wherein the shape of the mold for a lens element thewearer is determined based on the mold data, the coating mold transferlaw and the cooling transfer law. 3-17. (canceled)
 18. A methodimplemented by computer means for determining a lens element, the lenselement comprising: a holder comprising a refraction area having arefractive power based on a prescription for correcting an abnormalrefraction of an eye of the person; a plurality of optical elementsplaced on at least one surface of the holder so as to at least one ofslow down, retard or prevent a progress of the abnormal refraction ofthe eye of the person; and at least one layer of at least one coatingelement covering at least a zone of at least one optical elements and atleast a zone of the holder on which the optical elements are placed,wherein the method comprises: providing lens data, the lens dataindicating at least a shape of the lens element to be determined, theshape of the lens element corresponding to a shape of the holder and toat least a shape of the optical elements of the lens element, the shapeof the optical elements being associated with a targeted opticalfunction; providing a coating lens transfer law associated with acoating process of a lens element comprising the optical elements, thecoating process being associated with the coating element, the coatinglens transfer law corresponding to transformations to apply to the shapeof the surface of the lens element comprising the optical elements forcompensating modifications of the targeted optical function of saidoptical elements induced by the coating process; and determining thelens element based at least on the lens data and the coating lenstransfer law.
 19. A method implemented by computer means for determininga transfer law associated with a coating process of a lens element, themethod comprising: providing a lens element, the lens elementcomprising: a holder comprising a refraction area having a firstrefractive power, at least one optical element having at least onetargeted optical function and placed on at least one surface of theholder, the at least one targeted optical function being different fromthe first refractive power, coating at least a zone of the holder and atleast a zone of at least one optical element with at least one coatingelement based on a coating process, the coating process being associatedwith the at least one coating element; measuring at least one opticalcharacteristic of at least a zone of the at least one optical elementcovered by the coating element; determining at least one opticalcharacteristic error based on a comparison of the measured at least oneoptical characteristic of the coated optical element and the at leastone targeted optical function; compiling information corresponding tothe determined optical characteristic error into database as correctioninformation; determining a transfer law associated with the coatingprocess and the at least one optical element based on the correctioninformation of the database, the transfer law correcting an originalshape of the surface of the lens element comprising the at least oneoptical element so that once coated by the at least one coating element,said at least one coated optical element reaches a targeted opticalfunction.
 20. (canceled)